My board will no longer join my WiFi. It had been working but this morning when I tried to access my pool controller web page, nothing. I tried to access the IDE, nothing. I did an address scan of my network and it's not there. I switched to it's access point, brought up the IDE and tried to switch networks. Sometimes it balked at the password although I'm reasonably sure it was correct. Sometimes it seemed to connect as I got a disconnect message from the IDE via the access point. Switching networks showed it still missing. I noticed if I just stayed on the access point network the IDE came back. It seemed like it connected to my network and then failed back.
Perhaps unrelated but I decided to try and reinstall the update. Remove power, hold program button, apply USB power, and the green LED flashes slowly. The board appears in my Finder as a new device. Copy the img onto the drive, the green LED flashes rapidly and I get a message about 0 bytes of 889k... At that point I get a message that the board was ejected improperly and the board appears to reset.